Puerto Rico (before 1957)

First 4 Clubs Founded:
1911 Comercio Sporting Club (formed two teams, Minerva and Mercurio)
1913 (Real) San Juan FC (disappeared in 1950s)
1913 Ponce Sporting Club
1914 Celtics FC (first club founded by "Americans", not Hispanics)
NB: Minerva and Mercurio played in the Copa Porananmiz, the first
organised tournament.
Other clubs known to have existed before 1958 (earliest known
mention between brackets):
Nautico FBC (1937)
YMCA (San Juan) (1946; not at highest level)
Arqueros Verdes (1947)
Caribes FC (1947)
Arecibo FC (1949)
España FC (1949)
Guayama FC (1949)
Hato Rey FC (1949)
Mayagüez FC (1949)
Santurce (1951)
Reported Match Results (presumably championship)
[Jun 1949]
Hato Rey FC 1-1 San Juan FC
Arecibo FC 4-3 San Juan FC
In 1937, a combined team from San Juan FC and Nautico FBC
drew a match 1-1 against a team from an Argentine war ship,
the Presidente Sarmiento.
In November 1949, San Juan FC won a match 5-0 against a team
from two Canadian ships, the Magnificent and the Haida.